Hi. I've been having sharp, quick pains in both eyes, more to my left eye than right. This has been going on for about 1 week. Today for the first time I experienced a sudden partial vision loss. The only thing I saw was a big black ball. It lasted about 10 to 15 seconds. This only happened to the left eye, then it went away gradually. I'm concerned about a detached retina. My eyes are healthy as far as I know.